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How long did a transaction spend in the mempool?

Ethereum Asked by jespern on December 22, 2021

I’m trying to create some statistics on how long a transaction spends in the mempool before being included in a block, so I can reason about future gas prices. It would appear transactions in Ethereum don’t receive a timestamp until they’re mined, so instead, what is the best way of observing when a transaction was submitted? If I ask Parity to inform me of all new pending transactions, and recording the local timestamp at that time, quite often the block it ends up being included in, has a timestamp that is prior to when I saw it, so this seems wildly unreliable.

Wondering how other API’s obtain this information reliably, and how “gas station” sites intelligently calculate this information.

One Answer

It is done similarly as you said. An application frequently checks to parity/geth the pending queue and stores in a database the changes.

You can have this application running in several nodes in different cloud providers to have a more broad view.

Some times block explorer companies will modify the clients their run to suit their usage. Like instead of polling for changes just trigger them when a new transaction appear.

Answered by Ismael on December 22, 2021

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